标题： 使用气相色谱和四极杆质谱仪的氢气分析 显示英文标题

标题： HD gas analysis with Gas Chromatography and Quadrupole Mass Spectrometer

摘要： 开发了一种气体分析系统，用于分析氕氘气（HD），以生产用于SPring-8光致介子产生实验的冻极化HD靶，小量的正交态氕$_{2}$和对称态氘$_{2}$混合物（$\sim$0.01%）在纯化的HD气体中是实现冻极化靶的关键。为了可靠地获得这些气体混合物在HD气体中的浓度，我们设计了一种新的气体分析系统，结合了气相色谱法和四极质谱法的两种独立测量方法。通过气相色谱法的保留时间和质荷比，分离出对称态氕$_{2}$、正交态氕$_{2}$、HD以及氘$_{2}$。 研究发现，新的气体分析仪系统能够以良好的信噪比测量微量的正交-H$_2$和 D$_2$，其浓度低至 0.01%$\sim$。 显示英文摘要

摘要： A gas analyzer system has been developed to analyze Hydrogen-Deuteride (HD) gas for producing frozen-spin polarized HD targets, which are used for hadron photoproduction experiments at SPring-8. Small amounts of ortho-H$_{2}$ and para-D$_{2}$ gas mixtures ($\sim$0.01%) in the purified HD gas are a key to realize a frozen-spin polarized target. In order to obtain reliable concentrations of these gas mixtures in the HD gas, we produced a new gas analyzer system combining two independent measurements with the gas chromatography and the QMS. The para-H$_{2}$, ortho-H$_{2}$, HD, and D$_{2}$ are separated using the retention time of the gas chromatography and the mass/charge. It is found that the new gas analyzer system can measure small concentrations of $\sim$0.01% for the otho-H$_2$ and D$_2$ with good S/N ratios.